How to use $this->db->empty_table() for many tables?

[eluser]shinokada[/eluser]
I have 20 tables to empty.

When I use it following the first one does not work. And the second method only empties the first table.

What is the best way to empty many tables?
Do I have empty one by one?

Thanks in advance.

Code:

// first
$tables = array('table1','table2',....)
$this->db->empty_table($tables);    

// second
$this->db->empty_table('table1','table2',....);